First, XRP is not a cryptocurrency, and it has no place in this market. This is a common coin of the banking sector. I do not think that it will shift Etherium to the 3rd place, it will be very difficult. ETH is also not standing still
XRP has its place in the market, even if you won't consider XRP as a cryptocurrency we can't deny that it has the capability to claim the top 2 as it did last 2018. He replaced XRP because it shows an outstanding improvement it does last year. ETH is also good crypto but XRP is competing with it and they are both showing their improvement for the past years.